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SHORT-TERM DEBT AND LINES OF CREDIT - REVOLVING CREDIT FACILITIES (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Revolving credit facilities
Short-term credit capacity	$ 3,300.0
Available capacity under existing credit facility	2,491.3
Letter of credit
Revolving credit facilities
Letters of credit issued inside credit facilities	2.3
Commercial paper
Revolving credit facilities
Commercial paper outstanding	806.4	$ 1,114.4
WE \| Credit facility maturing September 2026
Revolving credit facilities
Short-term credit capacity	500.0
WPS \| Credit facility maturing September 2026
Revolving credit facilities
Short-term credit capacity	400.0
WG \| Credit facility maturing September 2026
Revolving credit facilities
Short-term credit capacity	350.0
PGL \| Credit facility maturing September 2026
Revolving credit facilities
Short-term credit capacity	350.0
WEC Energy Group \| Credit facility maturing September 2026
Revolving credit facilities
Short-term credit capacity	1,500.0
WEC Energy Group \| Credit facility maturing October 2025
Revolving credit facilities
Short-term credit capacity	$ 200.0